Abstract
Voyager's plasma probe observations suggest that there are at least three fundamentally different plasma regimes in Saturn: the hot outer magnetosphere, the extended plasma sheet, and the inner plasma torus. At the outer regions of the inner torus some ions have been accelerated to reach energies of the order of 43 keV. We develop a model that calculates the acceleration of charged particles in the Saturn's magnetosphere. We propose that the stochastic electric field associated to the observed magnetic field fluctuations is responsible of such acceleration. A random electric field is derived from the fluctuating magnetic field – via a Monte Carlo simulation – which then is applied to the momentum equation of charged particles seeded in the magnetosphere. Taking different initial conditions, like the source of charged particles and the distribution function of their velocities, we find that particles injected with very low energies ranging from 0.129 eV to 5.659 keV can be strongly accelerated to reach much higher energies ranging from 22.220 eV to 9.711 keV as a result of 125,000 hitting events (the latter are used in the numerical code to produce the particle acceleration over a predetermined distance).
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Atreya, S.K., White, J.H. Jr., Donahue, T.M., et al.: in Gehrels, T., Matthews, M.S. (eds.), Saturn, pp. 239–277. University of Arizona, Press, Tucson (1984)
Baum, W.A., Kreidl, T., Westphal, J.A., et al.: Icarus 47, 84–96 (1981)
Barbosa, D.D.: J. Geophys. Res. 99(A7), 13509–13520 (1994)
Box, G.E.P., Muller, M.E.: Annals Math. Stat. 29, 610–611 (1958)
Bridge, H.S., Belcher, J.W., Lazarus, A.J., et al.: Science 212(10), 217–224 (1981)
Bridge, H.S., Bagenal, F., Belcher, J.W., et al.: Science 215, 563–570 (1982)
Durand-Manterola, H.: in IX Meeting of the Dynamic Fluids Division, Sociedad Mexicana de Física, 17–19 November 2003, México D. F., pp. 142 (2003)
Eviatar, A., Richardson, J.: J. Geophys. Res. 91(A3), 3299–3303 (1986)
Frank, L.A., Burek, B.G., Ackerson, K.L., et al.: J. Geophys. Res. 85, 5695–5708 (1980)
Fujimoto, M., Nishida, A.: J. Geophys. Res. 95, 3841–3853 (1990)
Greiner, W., Neise, L., Stöcker, H.: Thermodynamics and Statistical Mechanics, pp. 10–13. Springer-Verlag, Germany (1995)
Gurnett, D.A., Scarf, F.L., Kurth, W.S.: J. Geophys. Res. 87, 1395–1403 (1982)
Hammersley, J.M., Handscomb, D.C.: in Bartlett, M.S., Cox, D.R. (eds.), Monographs on Applied Probability and Statistics, London Chapman and Hall, United States (1964)
Jackson, J.D.: Classical Electrodynamics, pp. 661–671. John Wiley & Sons, United States (1999)
Jurac, S., McGrath, M.A., Johnson, R.E., et al.: Geophys. Res. Lett. 29(24), 2172 (2002)
Krimigis, S.M., Armstrong, T.P., Axford, W.I., et al.: Science 212(10), 225–231 (1981)
Krimigis, S.M., Armstrong, T.P., Axford, W.I., et al.: Science 215(29), 571–577 (1982)
McDonald, F.B., Schardt, A.W., Trainor, J.H.: J. Geophys. Res. 85, 5813–5830 (1980)
MacLennan, C.G., Lanzerotti, L.J., Krimigis, S.M., et al.: J. Geophys. Res. 87(A3), 1411–1418 (1982)
Morrison, D., Owen, T., Soderblom, L.A.: in Burns, J.A., Matthews M.S. (eds.), Satellites, pp. 764–801 (1986)
Ness, N.F., Acuña, M.H., Behannon, K.W., et al.: Science 215, 558–563 (1982)
Richardson, J.D.: Rev. Geophys. 36(4), 501–524 (1998)
Saur, J., Politano, H., Pouquet, A., et al.: Astron. Astrophys. 386, 699–708 (2002)
Schardt, A.W., Kurth, W.S., Lepping, R.P., et al.: J. Geophys. Res. 90(A9), 8539–8542 (1985)
Sittler, E.C., Jr., Ogilvie, K.W., Scudder, J.D.: J. Geophys. Res. 88, 8847–8870 (1983)
Stone, E.C., Miner, E.D.: Science 212, 159–163 (1981)
Soderblom, L.A., Johnson, T.V.: Scientific American 246, 101–114 (1982)
Van Allen, J.A., Randall, B.A., Thomsen, M.F.: J. Geophys. Res. 85, 5679–5694 (1980)
Wolfe, J.H., Mihalov, J.D., Collard, H.R., et al.: Science 207, 403–407 (1980)
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Martínez-Gómez, E., Durand-Manterola, H.J. & Tejada, H.P.d. Stochastic Acceleration of Energetic Particles in the Magnetosphere of Saturn. Astrophys Space Sci 306, 259–267 (2006). https://doi.org/10.1007/s10509-006-9271-0
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DOI: https://doi.org/10.1007/s10509-006-9271-0